[conspire] Re: HELP - Can't Get Ethernet Card Working in Debian on Laptop
rick at linuxmafia.com
Fri Feb 17 12:01:13 PST 2006
Quoting Rick Moen (rick at linuxmafia.com):
> $ dig -t mx INBOUND.MARKSREBNIKARCHITECT.COM.NETSOLMAIL.NET +short
This was a mistaken cut-and-paste on my part (just in case it confused
anyone). The actual command line was
$ dig -t mx marksrebnikarchitect.com +short
(which means "Please tell me what type MX = mail exchanger records exist in
the DNS for marksrebnikarchitect.com -- and and report the results in
short format, without all the extra information of a full DNS query
"dig" is a very cool tool for finding out about DNS information.
"What are the namservers for the linuxmafia.com domain?"
$ dig -t ns linuxmafia.com +short
"What does the first of those nameservers think is the IP address for
the main linuxmafia.com host?"
$ dig -t a linuxmafia.com @ns.on.primate.NET +short
"Does the second nameserver agree with the first one, on that?
$ dig -t a linuxmafia.com @ns.primate.NET +short
"What's the reverse-DNS ('PTR') entry for that IP address?
$ dig -x 18.104.22.168 +short
"Is there a type HINFO (host information) entry for that hostname?"
$ dig -t hinfo linuxmafia.com +short
"Is there a type LOC (geographical location) entry for that hostname?"
$ dig -t loc linuxmafia.com +short
37 25 53.825 N 122 11 52.128 W 15.00m 1m 10000m 10m
"Where is SMTP e-mail accepted for linuxmafia.com (where are its MX =
mail exchanger hosts), and in what order of priority?"
$ dig -t mx linuxmafia.com +short
"Where is the master nameserver for linuxmafia.com's DNS, and what is
the DNS administrative e-mail contact?"
$ dig -t soa linuxmafia.com +short
ns1.linuxmafia.com. rick.deirdre.NET. 2006021500 7200 3600 2419200 259200
(Those are the first two data items included in the SOA = Start of
Authority record, with the e-mail address's "@" symbol changed into a
period for arcane old-software reasons. The other numbers are the
zonefile serial number and four timeouts.)
"How is authority delegated down from the root namservers for DNS
queries about domain linuxmafia.com -- by what path of delegation from
root to .COM to linuxmafia.com?"
$ dig linuxmafia.com +trace +short
NS M.ROOT-SERVERS.NET. from server 22.214.171.124 in 473 ms.
NS A.ROOT-SERVERS.NET. from server 126.96.36.199 in 474 ms.
NS B.ROOT-SERVERS.NET. from server 188.8.131.52 in 474 ms.
NS C.ROOT-SERVERS.NET. from server 184.108.40.206 in 474 ms.
NS D.ROOT-SERVERS.NET. from server 220.127.116.11 in 474 ms.
NS E.ROOT-SERVERS.NET. from server 18.104.22.168 in 474 ms.
NS F.ROOT-SERVERS.NET. from server 22.214.171.124 in 474 ms.
NS G.ROOT-SERVERS.NET. from server 126.96.36.199 in 474 ms.
NS H.ROOT-SERVERS.NET. from server 188.8.131.52 in 474 ms.
NS I.ROOT-SERVERS.NET. from server 184.108.40.206 in 474 ms.
NS J.ROOT-SERVERS.NET. from server 220.127.116.11 in 474 ms.
NS K.ROOT-SERVERS.NET. from server 18.104.22.168 in 474 ms.
NS L.ROOT-SERVERS.NET. from server 22.214.171.124 in 474 ms.
A 126.96.36.199 from server ns.on.primate.net in 103 ms.
It's very likely the primary tool used behind the scenes (along with
some scripted SMTP probes) by the ever-useful DNS report CGI at
http://www.dnsreport.com/ , which I also recommend.
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